Liquid level gauge



FIG. 1 is a right side isometric view of a liquid level gauge showing my new design;

FIG. 2 is a left side isometric view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines shown on the drawings represent unclaimed portions of the design and form no part thereof. 

The ornamental design for a liquid level gauge, as shown and described. 